The value of all land for sale in Rio Grande County recently was approximately $116 million, representing a total of 63,842 acres of land for sale in Rio Grande County. Rio Grande County ranks 32nd in the Mile High State based on the total amount of acres of land for sale among all the counties in the Rocky Mountain State. Of all ranches, farms, hunting land and other rural land and acreage for sale in Rio Grande County, South Fork had the most land for sale. Rio Grande County is the 45th largest county (912 square miles) in Colorado. It's located in the South Central Colorado region of Colorado.